40
TROUBLESHOOTING
DMS-EPC (models with an external pumping chamber)
FAULT
CHECK (POSSIBLE CAUSE)
REMEDY
Pump does not start
and makes no noise.
A. Check that there is power to pump.
B. Check the protection fuses.
C. Check the float switch.
A. Check that there is power
to pump.
B. If fuses are burnt-out, change
them.
C. Ensure that the float moves
freely. Ensure that the float is
operating correctly. (Contact
the supplier).
Pump does not
deliver.
A. Inspect base of pump for rag and/or
blockages.
B. The impeller is worn or blocked.
C. The check valve, if installed on the
delivery pipe may be compromised.
D. The level of the liquid is too low.
E. The required head is higher than
the pump is designed for.
A. Remove the blockage.
B. No serviceable parts in
the pump.
C. Check that twhe valve is
operating correctly and
replace if it necessary.
D. Adjust the length of the float
switch cable.
E. Contact WPL (See footer)
Pump does not stop.
A. The pump is not deactivated by
the float switch.
A. Ensure that the float moves
freely. Check float operation
(the contacts could be
damaged - contact the
supplier).
Flow is insufficient.
A. Check for blockages.
B. Ensure that the impeller or the
delivery pipe is not partly blocked
or encrusted.
C. Check three-phase motors for
blockages or build-up.
A. Remove any blockage.
B. Remove any blockage.
C. Check rotation of the motor.
Thermal overload
protection stops the
pump.
A. Check that the liquid to be
pumped is not too dense as this
could cause the motor to overheat.
B. Check that the water temperature
is not too high.
C. The pump may be partly blocked
by impurities.
D. The pump is mechanically blocked.
A. Check operation of
system i.e. de-sludge air
to chamber process.
B. Investigate possible cause.
C. Carefully clean the pump.
D. Check whether there
is rubbing between the
moving and fixed parts; check
the wear of the bearings
(contact the supplier).
